if_pflog.c revision 1.13
1 /* $NetBSD: if_pflog.c,v 1.13 2008/11/07 00:20:13 dyoung Exp $ */ 2 /* $OpenBSD: if_pflog.c,v 1.24 2007/05/26 17:13:30 jason Exp $ */ 3 4 /* 5 * The authors of this code are John Ioannidis (ji (at) tla.org), 6 * Angelos D. Keromytis (kermit (at) csd.uch.gr) and 7 * Niels Provos (provos (at) physnet.uni-hamburg.de). 8 * 9 * This code was written by John Ioannidis for BSD/OS in Athens, Greece, 10 * in November 1995. 11 * 12 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 13 * by Angelos D. Keromytis. 14 * 15 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 16 * and Niels Provos. 17 * 18 * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis 19 * and Niels Provos. 20 * Copyright (c) 2001, Angelos D. Keromytis, Niels Provos. 21 * 22 * Permission to use, copy, and modify this software with or without fee 23 * is hereby granted, provided that this entire notice is included in 24 * all copies of any software which is or includes a copy or 25 * modification of this software. 26 * You may use this code under the GNU public license if you so wish. Please 27 * contribute changes back to the authors under this freer than GPL license 28 * so that we may further the use of strong encryption without limitations to 29 * all. 30 * 31 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 32 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 33 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 34 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 35 * PURPOSE. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: if_pflog.c,v 1.13 2008/11/07 00:20:13 dyoung Exp $"); 40 41 #ifdef _KERNEL_OPT 42 #include "opt_inet.h" 43 #endif 44 45 #include "bpfilter.h" 46 #include "pflog.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/mbuf.h> 51 #include <sys/proc.h> 52 #include <sys/socket.h> 53 #include <sys/ioctl.h> 54 55 #include <net/if.h> 56 #include <net/if_types.h> 57 #include <net/route.h> 58 #include <net/bpf.h> 59 60 #ifdef INET 61 #include <netinet/in.h> 62 #include <netinet/in_var.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/ip.h> 65 #endif 66 67 #ifdef INET6 68 #ifndef INET 69 #include <netinet/in.h> 70 #endif 71 #include <netinet6/nd6.h> 72 #endif /* INET6 */ 73 74 #include <net/pfvar.h> 75 #include <net/if_pflog.h> 76 77 #define PFLOGMTU (32768 + MHLEN + MLEN) 78 79 #ifdef PFLOGDEBUG 80 #define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0) 81 #else 82 #define DPRINTF(x) 83 #endif 84 85 void pflogattach(int); 86 #ifdef _LKM 87 void pflogdetach(void); 88 #endif /* _LKM */ 89 int pflogoutput(struct ifnet *, struct mbuf *, const struct sockaddr *, 90 struct rtentry *); 91 int pflogioctl(struct ifnet *, u_long, void *); 92 void pflogstart(struct ifnet *); 93 int pflog_clone_create(struct if_clone *, int); 94 int pflog_clone_destroy(struct ifnet *); 95 96 LIST_HEAD(, pflog_softc) pflogif_list; 97 struct if_clone pflog_cloner = 98 IF_CLONE_INITIALIZER("pflog", pflog_clone_create, pflog_clone_destroy); 99 100 struct ifnet *pflogifs[PFLOGIFS_MAX]; /* for fast access */ 101 102 void 103 pflogattach(int npflog) 104 { 105 int i; 106 107 LIST_INIT(&pflogif_list); 108 for (i = 0; i < PFLOGIFS_MAX; i++) 109 pflogifs[i] = NULL; 110 if_clone_attach(&pflog_cloner); 111 } 112 113 #ifdef _LKM 114 void 115 pflogdetach(void) 116 { 117 int i; 118 119 for (i = 0; i < PFLOGIFS_MAX; i++) { 120 if (pflogifs[i] != NULL) 121 pflog_clone_destroy(pflogifs[i]); 122 } 123 if_clone_detach(&pflog_cloner); 124 } 125 #endif /* _LKM */ 126 127 int 128 pflog_clone_create(struct if_clone *ifc, int unit) 129 { 130 struct ifnet *ifp; 131 struct pflog_softc *pflogif; 132 int s; 133 134 if (unit >= PFLOGIFS_MAX) 135 return (EINVAL); 136 137 if ((pflogif = malloc(sizeof(*pflogif), M_DEVBUF, M_NOWAIT)) == NULL) 138 return (ENOMEM); 139 bzero(pflogif, sizeof(*pflogif)); 140 141 pflogif->sc_unit = unit; 142 ifp = &pflogif->sc_if; 143 snprintf(ifp->if_xname, sizeof ifp->if_xname, "pflog%d", unit); 144 ifp->if_softc = pflogif; 145 ifp->if_mtu = PFLOGMTU; 146 ifp->if_ioctl = pflogioctl; 147 ifp->if_output = pflogoutput; 148 ifp->if_start = pflogstart; 149 ifp->if_type = IFT_PFLOG; 150 #ifndef __NetBSD__ 151 ifp->if_snd.ifq_maxlen = ifqmaxlen; 152 #endif /* !__NetBSD__ */ 153 ifp->if_hdrlen = PFLOG_HDRLEN; 154 if_attach(ifp); 155 if_alloc_sadl(ifp); 156 157 #if NBPFILTER > 0 158 #ifdef __NetBSD__ 159 bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN); 160 #else 161 bpfattach(&pflogif->sc_if.if_bpf, ifp, DLT_PFLOG, PFLOG_HDRLEN); 162 #endif /* !__NetBSD__ */ 163 #endif 164 165 s = splnet(); 166 LIST_INSERT_HEAD(&pflogif_list, pflogif, sc_list); 167 pflogifs[unit] = ifp; 168 splx(s); 169 170 return (0); 171 } 172 173 int 174 pflog_clone_destroy(struct ifnet *ifp) 175 { 176 struct pflog_softc *pflogif = ifp->if_softc; 177 int s; 178 179 s = splnet(); 180 pflogifs[pflogif->sc_unit] = NULL; 181 LIST_REMOVE(pflogif, sc_list); 182 splx(s); 183 184 #if NBPFILTER > 0 185 bpfdetach(ifp); 186 #endif 187 if_detach(ifp); 188 free(pflogif, M_DEVBUF); 189 return (0); 190 } 191 192 /* 193 * Start output on the pflog interface. 194 */ 195 void 196 pflogstart(struct ifnet *ifp) 197 { 198 struct mbuf *m; 199 int s; 200 201 for (;;) { 202 s = splnet(); 203 IF_DROP(&ifp->if_snd); 204 IF_DEQUEUE(&ifp->if_snd, m); 205 splx(s); 206 207 if (m == NULL) 208 return; 209 else 210 m_freem(m); 211 } 212 } 213 214 int 215 pflogoutput(struct ifnet *ifp, struct mbuf *m, 216 const struct sockaddr *dst, struct rtentry *rt) 217 { 218 m_freem(m); 219 return (0); 220 } 221 222 /* ARGSUSED */ 223 int 224 pflogioctl(struct ifnet *ifp, u_long cmd, void *data) 225 { 226 int error = 0; 227 228 switch (cmd) { 229 case SIOCSIFFLAGS: 230 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 231 break; 232 /*FALLTHROUGH*/ 233 case SIOCINITIFADDR: 234 case SIOCAIFADDR: 235 case SIOCSIFDSTADDR: 236 if (ifp->if_flags & IFF_UP) 237 ifp->if_flags |= IFF_RUNNING; 238 else 239 ifp->if_flags &= ~IFF_RUNNING; 240 break; 241 default: 242 error = ifioctl_common(ifp, cmd, data); 243 } 244 245 return error; 246 } 247 248 int 249 pflog_packet(struct pfi_kif *kif, struct mbuf *m, sa_family_t af, u_int8_t dir, 250 u_int8_t reason, struct pf_rule *rm, struct pf_rule *am, 251 struct pf_ruleset *ruleset, struct pf_pdesc *pd) 252 { 253 #if NBPFILTER > 0 254 struct ifnet *ifn; 255 struct pfloghdr hdr; 256 257 if (kif == NULL || m == NULL || rm == NULL || pd == NULL) 258 return (-1); 259 260 if ((ifn = pflogifs[rm->logif]) == NULL || !ifn->if_bpf) 261 return (0); 262 263 bzero(&hdr, sizeof(hdr)); 264 hdr.length = PFLOG_REAL_HDRLEN; 265 hdr.af = af; 266 hdr.action = rm->action; 267 hdr.reason = reason; 268 memcpy(hdr.ifname, kif->pfik_name, sizeof(hdr.ifname)); 269 270 if (am == NULL) { 271 hdr.rulenr = htonl(rm->nr); 272 hdr.subrulenr = -1; 273 } else { 274 hdr.rulenr = htonl(am->nr); 275 hdr.subrulenr = htonl(rm->nr); 276 if (ruleset != NULL && ruleset->anchor != NULL) 277 strlcpy(hdr.ruleset, ruleset->anchor->name, 278 sizeof(hdr.ruleset)); 279 } 280 if (rm->log & PF_LOG_SOCKET_LOOKUP && !pd->lookup.done) 281 pd->lookup.done = pf_socket_lookup(dir, pd); 282 if (pd->lookup.done > 0) { 283 hdr.uid = pd->lookup.uid; 284 hdr.pid = pd->lookup.pid; 285 } else { 286 hdr.uid = UID_MAX; 287 hdr.pid = NO_PID; 288 } 289 hdr.rule_uid = rm->cuid; 290 hdr.rule_pid = rm->cpid; 291 hdr.dir = dir; 292 293 #ifdef INET 294 if (af == AF_INET && dir == PF_OUT) { 295 struct ip *ip; 296 297 ip = mtod(m, struct ip *); 298 ip->ip_sum = 0; 299 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 300 } 301 #endif /* INET */ 302 303 ifn->if_opackets++; 304 ifn->if_obytes += m->m_pkthdr.len; 305 306 #ifdef __NetBSD__ 307 bpf_mtap2(ifn->if_bpf, &hdr, PFLOG_HDRLEN, m); 308 #else 309 bpf_mtap_hdr(ifn->if_bpf, (char *)&hdr, PFLOG_HDRLEN, m, 310 BPF_DIRECTION_OUT); 311 #endif /* !__NetBSD__ */ 312 313 #endif 314 315 return (0); 316 } 317
Indexes created Wed Sep 24 22:09:59 GMT 2025